I was 14 until I realised that pipe-cleaners were for cleaning pipes. I had never seen them used for anything other than arts and crafts.
It wasn't until I saw them for sale in a tabaconist that I broke the word down and realised it was a "pipe" - "cleaner".
A childhood belief about hobbies

others believed things like this
- I used to think a drain pipe in my backyard led to another world.Anon
- I used to think that my dad was "smoking pot" when he would smoke his pipe while sitting on the toilet. Anon
- When I saw signs stating "Lots for sale" I thought it meant that there was a lot for sale.— Robin
- I used to think that 7-Up was called "Zup" until I realised the "Z" was actually a Seven!— Vic
- I used to believe that if a item wasn't "on sale" then you weren't aloud to buy it.— Meagan
- i used to think that franch was actually swearing !!!! until i realised it was just like english lol :PAnon